CAn someone help with 29

Iii-eneral sciencewhich of these is the best explanation of how a smooth round stone became smooth? a continuous freezing and thawingbvolcanic actioncit fell off the side of a cliffdit was in a stream for a long time.

What happens when heat from inside earth is transferred to its surface? warmer material is pushed to the crust more dense material is pushed to the crust warmer material is pushed to the outer core less dense material is pushed to the outer core

Need this asap! geography 10 points! will mark brainliest! (this is a webquest < i'm bad at these) answer each question below thoroughly (3-4 sentences each): 1) has international aid done more harm than good for the people of africa? 2) what are the benefits of international aid? 3) what are the problems with international aid? 4) what are the alternatives to international aid? 5) what do you think is the best approach to offer international aid? whoever answer accordingly will get brainliest, youuu humans!